Apparatus for orbital finishing



Jan. 31, 1967 RAMPE 3,300,908

APPARATUS FOR ORBITAL FINISHING Filed NOV. 5, 1964 5 Sheets-Sheet 1INVENTOR.

JOHN E PAM/ 6 ATTORNEYS.

Jan. 31, 1967 J. F. RAMPE APPARATUS FOR ORBITAL FINISHING 5 Sheets-Sheet2 Filed Nov. 5, 1964 INVENTOR. JOHN F RAM/ E BY BoWZ/M, 5W Hm M WATTOENEfi Jan. 31, 1967 J. F. RAMPE APPARATUS FOR ORBITAL FINISHING 5Sheets-Sheet 5 Filed Nov. 5, 1964 F 3 INVENTOR.

JOHN E PAM/ E Jan. 31, 1967 J. F. RAMPE 3,300,908

APPARATUS FOR ORBITAL FINISHING Filed Nox r. 5, 1964 5 Sheets-Sheet 4Fig. 4

INVENTOR. JOHN F PAM/ e ATTOENEY5.

Jan. 31, 1967 .1. F. RAMPE APPARATUS FOR ORBITAL FINISHING 5Sheets-Sheet 5 Filed Nov.

INVENTOR, JOHN F. PAM/ r:-

BY BM, 5 /wa/ m M W QTTOEN'EYf United States Patent O 3,300,908APPARATUS FOR ORBITAL FINISHING John F. Rampe, 3417 Fairfax Road,Cleveland Heights, Ohio 44118 Filed Nov. 5, 1964, Ser. No. 409,166 18Claims. (Cl. 51-163) This invention relates to the finishing ofcommercial parts by vibratory action, and more particularly to finishingapparatus of the orbital type.

In my application, Serial No. 261,981, filed March 1, 1963, and nowPatent No. 3,191,348 dated June 29, 1965, I have disclosed an apparatusfor orbital finishing in which pairs of part-carrying tubs or workpiececontainers are mounted on opposite sides of a vibratory or rotary shaftand the carriage supporting the tubs is driven through a small orbitalpath. In my application Serial No. 357,212 filed April 3, 1964 forFinishing Apparatus, I have disclosed a vibratory type of orbitalfinishing machine which is capable of continuous operation as well asbatch operation. The machines which are the subjects of the abovementioned applications are particularly adapted to relatively largebatches of workpieces and accordingly are relatively large andexpensive.

An object of this invention is to provide an improved orbital typevibratory finishing machine which is compact in construction andeconomical in operation.

Another object of this invention to provide a vibratory type orbitalfinishing machine which is relatively economical in construction andhighly eflicient in operation.

Briefly in accordance with aspects of this invention, I have discoveredan improved orbital type vibratory finishing machine in which a carriageand a pair of flat plate counterpoises are mounted on a frame with arotating shaft extending through the carriage and the counterpoiseplates. Advantageously, the workpiece containing tub is mounted in apair of trunions and held in this position by four bolts only two ofeach need to be released in order to manually tilt the tub for dischargeof workpieces. On the opposite end of the carriage from the tub is acounter weight mounted on a suitable bracket, which counter weight ispreferably at least as heavy as the weight of the tub without itsworkload. Advantageously, the carriage is supported by four pairs ofshear type resilient bushings, one pair mounted on and projectinginwardly from each corner post of a rectangular frame. The apparatus isalso provided with a counterpoise in the form of a pair of substantiallyflat plates, each mounted on a pair of cross members or cross braces ofthe rectangular frame and positioned within the frame in close proximitywith the carriage. A rotary shaft is employed to produce the orbitalmovement and this shaft is rotatably mounted in the carriage andcounterpoise plates and has opposed pairs of eccentric sections inwardlyof the frame for rotating the carriage and the counterpoise plates inopposition to each other. Preferably the eccentricity of one pair ofeccentric members is substantially equal to the eccentricity of theother pair of eccentric members, so that the carriage and the sideplates or counterpoise plates will be driven through orbits of equalradius.

In accordance with the other aspects of this invention I provide anorbital type vibratory finishing apparatus with a generally rectangularframe in which cross members are provided between corner posts, whichcross members are formed of angle members having inwardly extendingsurfaces horizontal and vertical surfaces interiorly of the horizontalsurfaces. Shear type bushings are mounted on the vertical surfaces andproject outwardly relative to, but are contained within, the framesupporting the counterpoise plates or side plates. A tub supportingcarriage is mounted by resilient bushings of the shear type projectmastsing inwardly from and mounted on the corner posts. With this arrangementthe counterpoise and carriage are mounted within the frame and a pair ofcover plates attached to and substantially coplanar with the oppositesides of the frame acts as a cover for the apparatus. A drive shaft isrotatably mounted in the counterpoise plates and the carriage andsuitable driving motor is mounted on the top of the frame and connectingby a flexible belt to a pulley mounted on the end of the drive shaft.The vibratory apparatus includes a fluid flow system including are-circulation system for recirculating a fluid containing an abrasiveor a polishing compound. The fluid flow system is provided with meansfor separate flow controls permit automatic cycling of the mixture fromthe tub to a storage tank and return or permit fresh water to be flushedthrough the tub to a drain during the op erating cycle.

Other objects and advantages relate to certain novel features ofconstruction and combinations and arrangements of parts which provideeconomy in manufacture and operation. The invention is described inconnection with the accompanying drawings forming a part of thespecification and illustrating a preferred embodiment which representsthe best known mode of practicing the invention.

In the drawings:

FIGURE 1 is a view in perspective of the finishing machine of thepresent invention;

FIGURE 2 is a side view of the machine of FIGURE 1 to an enlarged scalewith portions of the machine removed and parts broken away;

FIGURE 3 is a side view of the embodiment of FIG. 1 taken from the lefthand side thereof to the same scale as FIG. 2;

FIGURE 4 is a front elevational view of the embodiment of FIG. 1 partlybroken away and partly in section, to the same scale as FIGS. 2 and 3;

FIGURE 5 is a view in perspective, to an enlarged scale, of the carriageof the apparatus for FIG. 1;

FIGURE 6 is a view in perspectiveshowing the vibratory assembly of theapparatus for FIG. 1 and the vibratory assembly drive mechanism; and

FIGS. 7A and 7B are detailed views of the resilient shear-type mountingbushings showing examples of the carriage and counterpoise mountings,respectively.

Referring now to the drawing which shows one illustrative embodiment ofthe apparatus of this invention including a frame 10 on which is mountedfor orbital vibratory motion a, tub carriage 11 which supports asuitable workpiece tub or barrel 12. Mounted on the top of the frame 10is an instrument control and driving mechanism assembly 13 including aninstrument panel 14. Also mounted on the frame 10 for oscillation in anorbital path out of phasewith the carriage 11 is a counterpoiseincluding a pair 'of side plates 15, 16. The apparatus includes asolution recirculation and drain reservoir 20' mounted centrally of thebase of the frame 10. Mounted on the instrument panel 14 a start-stopswitch 17, a pump switch 18 and a timer 19.

As shown in FIGURES 2 and 4, an electric motor 22 is mounted in theinstrument control and driving assembly 13 and motor 22 has an armatureshaft 23 connected in driving relationship to a drive shaft 24 of thevibratory assembly. Drive shaft 24 is mounted centrally of the carriage11 by means of a pair of bearings 25, .26 and has a pulley 27 splined orotherwise sewned to one end thereof, which pulley is connected in drivenrelationship to a pulley 28 on the shaft 23 by means of a suitableflexible belt 30.

The pulley 28 is part of a variable speed drive which includes a sheave33 secured to the shaft 23 and a slidable sheave 34 mounted for slidingmovement relative to axis of the shaft 23, keyed to the shaft 23 toprevent relative rotation and biased by means of a suitable spring 35toward sheave 33. The base of the motor 22 is secured to a pair of rightangle brackets 38 by suitable means such as by bolts 39 and nuts 40. Theright angle brackets 38 are drilled to provide two pairs of alignedapertures one pair of which encircle each of a pair of rods 42, 43 forsliding engagement such that the motor 22 may be moved from a forward toa rearward position along the rods 42, 43 i.e. transversely relative tothe motor axis. The rods 42, 43 are each supported by a pair of rightangle brackets such as the brackets 45, 46 which brackets are welded orotherwise secured to the top 44 of the frame 10. A threaded rod 48, onlythe end of which is shown, is rotatably mounted in angle brackets 45, 46and threadably engages a right angle bracket, not shown, similar to thebracket 38 and mounted beneath the frame of motor 22. A band wheel 50 issecured to the end of rod 48 and rotation of the hand wheel 50 causetranslation of the :motor 22 along the rods 42, 43. Because the sheave34- of pulley 28 is spring biased, it maintains pressure upon the belt30. If the motor 22 is moved away from the pulley 27 i.e. in arearwardly direction relatively to the instrument panel 14 then thepulley sheave 34 moves axially outwardly and the effective diameter ofthe driving pulley 28 is decreased thus causing the pulley 27 andshaft24 to be driven at a slower speed. With this arrangement of variablepulley diameter, it is possible to employ a motor having a speed of theorder of 3600 rpm. and to vary the speed at which the drive shaft 24 isdriven between a speed of 900 and 1800 revolutions per minute. This willproduce orbital vibration in the carriage 11 of 900 to 1800 orbits perminute, respectively. As a safety measureQthe pulleys 27, 28 and thebelt 30 are enclosed in a suitable belt guard 52.

The construction of the frame 10 is shown in detail in FIGURES 2, 3 and4. As therein depicted, the frame includes a base member 55 to which issecured four uprights or legs 56,57, 58 and 59. Each of the legs 56through 59 are formed from right angle stock and are Welded or otherwisesecured to the base member or base plate 55 with the angles facinginwardly. The legs 56, 57 are joined by a pair of right angledhorizontal braces 62, 63 which are welded or otherwise'secured tothelegs with the angles facing outwardly relative to the frame 10.Similarly, the legs 58, 59 are connected together by a pair ofhorizontal braces 64, 65 each formed of right angle stock with theangles facing outwardly relative to the frame 10. The sides of the frame10 are enclosed by a pair of side panels 67, 68 on the right and leftsides respectively. The side panels 67, 68 are mounted on the frame 10by means of bolts which engage the corners of the legs such as the bolts70, 71 of FIGURE 3 which engage the leg 59 and a bolt 72 which engages aright angle bracket 73 secured to the base plate 55. A similar rightangle bracket 74 is mounted on the opposite side of the base plate 55 toreceive a suitable panelengaging bolt, not shown.

As best seen in FIGURE the carriage assembly 11 includes a pair of sideplates 76, 77 which are secured together by an upper and a lowercentrally located cross brace 78, 79 respectively and a rear cross brace80. A pair of trunions 83, 84 are mounted on the side 76, 77respectively of the carriage 11 for the purpose of rotatably supportingthe tub or barrel 12. The trunions 83, 84 are positioned at an anglesuch as 55 relative to the bottom of the carriage 11 and are secured asby welding to the side plates so that the tub '12 may be lifted into aposition in which a pair of cylindrical trunion arms 85, 86 of the tub12 can fit within and rotatably engage the semi-cylindrical surfaces 88,89 of the trunions 83, 84 respectively. A separate pair of trunions 91,92 are positioned in engagement with the trunions 84, 83 respectivelyand are secured in engagement therewith by means of suitable threadedbolts such as the bolts 93. The tub or barrel 12 may be secured in anupright position by securely tightening the trunion bolts 93. Ifhowever, it is desired to rotate the tub to discharge its contents onepair of threaded bolts 93 is loosened for example the forward or lowerpair of bolts, one on each of trunions 91, 92, to permit the tub to bemanually rotated by means of a pair of handles 94. The carriage sideplates 76, '77 are provided with centrally located apertures W, 98respectively in which apertures are mounted the previously mentionedbushings or bearings 25, 26 respectively for rotatably supporting thedrive shaft 24. The bushings 25, 26 are secured to the side plates bysuitable means such as by bolts 101. The carriage 11 is provided with aweight 103 mounted on rear brace which statically balances the tub 12relative to the bearings 25, 26 when the tube is empty.

The carriage 11 and the counterpoise or side plates; 15, 16 constitutethe vibratory portions of the apparatus which are driven in an orbital,vertical path by means of the drive shaft 24, the motor 22, theconnecting belt 30 and pulleys 27, 28. The vibratory system is mountedin the frame 10 by means of a number of resilient shear= type bushings.For example, the counterpoise or side plate 15 is mounted by means of apair of horizontally extending bushings 105, 106 each secured to anoutwardly facing, vertically extending surface of the cross member 65 bymeans of a bolt such as bolts 107 and the opposite end of the bushing issecured to the counter poise 15 by means of a bolt such as the bolt 108.Similarly the lower end of the side plate 15 is resiliently mounted onthe cross members 64 by means of a pair of resilient shear-type bushings109, 110 each held by a pair of bolts 107, 108. These bushings will besubsequently described in detail. The counterpoise or side plate member16 is mounted from the frame 10 by means of four resilient shear-typebushings 112, 113, 114 and 115 each sewned by a pair of bolts 107, 108.These bushings are also connected to the outwardly facing surfaces ofthe horizontal cross members 62, 63 in a manner similar to the bushings105, 106, 109 and 110. The left side 7-6 of the carriage 11 is mountedby four shear bushings 116, 117, 118 and 119 to the legs 58, 59-01 theframe 10. Similarly, the carriage side plate 77 is mounted on the legs56, 57 by means of pairs of shear-type resilient bushings 120, 121, 122and 123. Because the resilient bushing and flexible belt 30 constitutethe only physical connections between the frame 10 and the vibratoryassembly including the carriage 11, the co-unterpoise plates 15, 16, andthe drive shaft 24 and because the vibrating assembly is dynamicallybalanced, the vibratory assembly imparts very little vibration to theframe 10.

The details of the resilient bushings are best seen in FIGURES 7A and 7Bwhich are fragmentary views, to an enlarged scale, relative to FIGS. 26showing the con nections between the carriage side plate 76 and theframe leg 59 and between the frame horizontal brace 64 and thecounterpoise member 15 respectively. -In FIGURE 7A, the resilientbushing 116 is mounted between the carriage side plate 76 and the frameleg 59 by means of a nut and bolt assembly. The resilient bushing 116carries a cup shaped or concaved plate 125 which is recessed in anpreferably vulcanized to the end of the rubber, or other resilientmaterial, portion 126 and the cup shaped member 125 is welded orotherwise secured to a nut 127. The inner surface of. the nut isthreaded at 128 and receives the bolt 107 which passes through a lockwasher 131 and the side plate or carriage side '76. The opposite end ofthe resilient bushing 116 also carries a concave plate 132 which isidentical to the plate 125. Plate 132 is welded or otherwise secured toa hexagonal type nut 133 which is threaded at 134 to receive anelongated bolt 108. A spacer block 136 is mounted between the frame leg59 and the rubber "portion 126 of the bushing 116 so that the same sizeof shear type rubber bushing can be employed throughout the vibratorysystem of the finishing apparatus. Thus the resilient bushing 11-6 isidentical in size, shape and construction with the rubber bushing 106shown in FIGURE 7B and employed to mount the counterpoise plate 15 onthe frame side member 64. Spacer blocks such as spacer block 136 areemployed between each of the shear-type resilient bushings 116, .117,118 and 119 and 120, 121, 122, 123 and the respective leg member towhich they connect. A spring type lock washer 137 is employed betweenthe bolt 108 and the frame leg 59.

The counterpoise plates 15, 16 are coupled to the drive shaft 24 bymeans of a pair of bearing 129, 130. As best seen in FIG. 6, the generalconfiguration of the drive shaft 24 is substantially identical to thegeneral configuration of the drive shaft shown in my application, SerialNo. 357,212, filed April 3, 1964. In other words, the central portion138 of the drive shaft 24 has a diameter on the major center line of thedrive shaft 24 and a first pair of eccentric portions 139, 140 onopposite sides of the central portion 138 and adjoining thereto, whichportions are eccentric with regard to the major center line in onevertical direction and rotatably engage bearings 25, 26 respectively, inthe carriage 11. A second pair of eccentric sections 141, 142 arepositioned outwardly from the previously mentioned eccentric portions139 and 14 0, respectively, and have an eccentricity equal to and in theopposite direction from the eccentric sections 139, 141). The outersection 144 of the drive shaft 24 is concentric with the major centerline and pulley 27 is mounted on section 144 by suitable means such asby a spline and key arrangement, not shown.

The finishing apparatus has a liquid circulating system which includesmeans for supplying a fluent compound mix to the tub or barrel 12.Depending on the type of compound supplied, the compound may deburr,burnish or finish the workpieces placed in the tub 12. The apparatusalso includes means for rinsing the tub with clean fluid such as freshwater and for discharging the rinse to the drain during or after theoperating cycle. The tub 12 is provided with a drain aperture 146 in thebottom thereof and has an angle bracket 147 Welded or otherwise securedto the bottom of the tub 12 in a position of alignment with the aperture146 and a plug 148 is mounted on the bracket 147 by means of a threadedrod 149 and handle 150 for movement into a fluid sealing relationshiparound the aperture 146. When it is desired to drain the tub 12 or tocirculate the fluid through the tub 12, the handle 150 is manuallyrotated to move the plug 148 away from aperture 146 to permit the fluidto flow into the reservoir 20. The reservoir 26 includes a generallyrectangular tank 151 and a generally rectangular tank cover assembly152. The tank cover assembly is provided with a funnel-like member 153adjacent the forward end of the cover assembly 152 and provided with anelongated transverse slot 155 which communicates with the tank 151.Because this slot 155 is in the rearward portion of the funnel 153, theslot is positioned to communicate with a drain catch which will besubsequently described and located in the forward end of the tank 151 orwith the main reservoir section of the tank 151. The tank cover assembly152 is longer than the tank 151 and is provided with a downwardlyextending flange 154 which extends beyond the tank 151 to permit thetank cover 152 to slide longitudinally relative to the tank 151. Thusthe tank cover 152 can assume two terminal positions as indicated by thetwo dotted outlines in FIGURE 2. In the forward position, or leftwardposition as viewed in FIG. 2, the tank cover mounted on funnel 153controls, the flow of the fluid from the tank 12 or tub 12 such that itis discharged to a drain .catch and then to a drain pipe whereas in therearward funnel position, the fluid from the tank or tub 12 flows into amain res- 6 ervoir and is returned or recirculated by means of a pump,which will be subsequently described, to the tank or tub 12. The tank151 includes a drain catch 157 formed in the forward end of the tank 151by means of a right angled partition cooperating with the side walls andthe front wall of the tank 151. A drain pipe 158 communicates with thedrain catch 157 and extends through a bafiie 159 positioned laterallyacross the tank 151 and also extends through the rear wall 161) of thetank 151. If the cover 152 of the reservoir 20 is positioned in its rearterminal position or positioned to the right as viewed in FIGURE 2, thenthe elongated slot is behind the drain catch 157 such that fluid flowingfrom the tub 12 through the outlet 146 flows into the funnel 153 andinto a settling chamber of the tank 151 to the left of the baffle 159.When suflicient fluid has flowed into this portion of the reservoir, itoverflows the battle 159 which is shorter than the sidewalls, and flowsinto the rear section which contains a submersible pump 164. The pump164 has an intake 165 in communication with its periphery and an inletpipe 166 which is connected to the source of clean water. The pump isalso provided with a solenoid actuated valve, not shown, which can beemployed selectively to connect the intake side of the pump with eitherthe clear water inlet conduit 166 or the compound mix inlet 165 withinthe rearward chamber of the tank 151. In either event, the pump suppliesliquid through a pipe or tube 166 to the top of the tank or tub 12.Preferably, the switches 17, 1'8 and timer 19 are connected such thatwhen the timer 19 is in HOLD position or dialed to a cycle time, eitherthe machine motor 22 or the pump 164 can be operated. They are alsoconnected so that when the timer 19 times out and goes to OFF position,everything is deenergized.

In order to provide for lubrication of. the carriage bearings 25, 26 apair of grease lines 170, 171 are provided each of which communicateswith one of these bearings and terminates with a grease line inletfitting, such as fittings 173, 174. Bearings 129, 130 are provided withgrease fittings, not shown, accessible by removing side panels 67, 68.

In accordance with the patent statutes, the principals of. the presentinvention may be utilized in various ways, numerous modifications andalternations being contemplated, substitution of parts and changes inconstruction being resorted to as desired, it is understood that theembodiment shown in the drawings and described above is given merely forpurposes of explanation and illustration without intention to limit thescope of the claims to the specific details disclosed.

What is claimed is:

1. A vibratory device for finishing articles comprising:

frame means;

counterpoise means including a pair of counterpoise plates;

resilient means mounting each of said counterpoise plates within saidframe means;

a carriage;

resilient means mounting said carriage within said frame means andbetween said c-ounterpoise plates; eccentric means rotatably channeledin said carriage and in said counterpoise;

means mounted on said frame for driving said eccentric means and coupledthereto in driving relationship; and

tub means mounted in said carriage on oneside of said eccentric meansand a counterweight mounted in said carriage on the other side of .saideccentric means from said tub means balancing said tub means.

2. The combination according to claim 1 wherein said resilient meanscomprise a plurality of substantially cylindrical shear-type bushingsof. resilient material each having a concave metallic cup on theopposite ends thereof and fastening means secured to each of saidcon-cave cups.

3. The combination according to claim 1 wherein said tub means comprisesa substantially cylindrical tub mounted with its axis substantiallyhorizontal and having an aperture in the curved surface for thedischarge of fluent material and wherein said apparatus includes areservoir positioned beneath said tub for receiving said fluentmaterial.

4. The combination according to claim 3 wherein said reservoir includesa tank and cover means slida-bly mounted on said tank, said cover meansincluding funnel means, said tank including a drain catch portion, areservoir portion, and an overflow portion communicating with saidreservoir portion, said cover being slidable between a position in whichsaid :f-unnel means communicates with said drain catch portion and aposition in which said funnel means communicates with said reservoirportion.

5. In a vibratory finishing apparatus the combination comprising:

a generally rectangular frame including a plurality of verticallyextending legs;

a pair of counterpoise plates, each resiliently connected to said frameand positioned within said frame;

a carriage resiliently mounted on said frame between said plates;

a tub supported in said carriage for receiving the workpieces to befinished; and

drive means including a shaft having first and said second pairs ofeccentric members thereon, said first pair being rotatably coupled tosaid carriage, said second pair being rotatably coupled to said plates.

6. The combination according to claim 5 further comprising:

a fluid reservoir positioned beneath said tub, said tub having anaperture therein and closure means for closing said aperture and manualmeans for opening said closure means, said reservoir including,

a tank and a slidable top on said tank and having a discharge openingtherein for discharging fluid into said reservoir, said tank including adrain catch, -a settling chamber and an overflow chamber, and,

a pump having a discharge nozzle communicating with said tub and havingan inlet nozzle oommunicating with said overflow chamber.

7. The combination according to claim 6 including discharge meanscommunicating with said drain catch.

8. In a vibratory finishing apparatus, the combination comprising:

a generally rectangular frame including a plurality of verticallyextending legs and the plurality of horizontal members connecting saidlegs; 7

means resiliently mounting a pair of counterpoise plates on saidhorizontal members and within said frame;

a carriage;

resilient means mounting said carriage on said legs between saidcounterpoise plates;

a drive shaft having eccentric portions thereon and extending throughsaid counterpoise plates and said carriage and rotatably journalledtherein by means of pairs of said eccentric portions;

a tub rotatably mounted on said carriage receiving the workpieces to befinished; and

and drive means for driving said drive shaft to vibrate said tub throughan orbital path.

9. The combination according to claim 8 wherein said drive shaft ispositioned centrally of said carriage, said tub being positionedadjacent one end of said carriage and wherein said carriage includes acounterweight mounted on the opposite end of said carriage from said tubfor balancing said tub.

10. In a vibratory finishing apparatus, the combination comprising:

a generally rectangular frame including a plurality of verticallyextending legs;

a pair of counterpoise plates, each resiliently connected to said frameand positioned within said frame;

a carriage resiliently mounted on said frame between said plates;

a cylindrical tub rotatably mounted on said carriage with its axissubstantially horizontal, having an opening in the side thereof forreceiving workpieces to be finished and having a fluent materialdischarge means therein; and

drive means including a shaft having first and second pairs of eccentricmembers thereon said first pair being rotatably coupled to saidcarriage, said second pair being rotatably coupled to said plates.

11. The combination according to claim 10 including a fluent materialsystem including:

means for supplying fluent material to said tub;

means for draining said fluent material from said tub and dischargingsame; and

means for recirculating said fluent material.

12. The combination according to claim 10 wherein said frame includes aplurality of braces connecting said legs and wherein said counterpoiseplates are resiliently mounted on certain of said braces.

13. In a vibratory finishing apparatus, the combination comprising:

a generally rectangular frame including a plurality of verticallyextending legs and a plurality of crossbraces connecting said legs;

a pair of counterpoise members within said frame;

a plurality of shear-type resilient bushings and fastener means mountingeach of said bushings between said frame and said counterpoise members;

a carriage having a tub and a tub counterweight thereon;

a plurality of shear-type resilient bushing assemblies supporting saidcarriage on said frame and within said counterpoise members;

a drive shaft having a first and a second pair of eccentric portionsthereon, said pairs of eccentric portions being of equal eccentricityand being diametrically opposed;

a first pair of bearing means mounted on said carriage and rotata-blyengaging said first pair of eccentric portions;

a second pair of bearing means mounted on said counterpoise members androtatably engaging said second pair of eccentric portions; and

motor means for rotating said drive shaft.

14. The combination according to claim 13 wherein said tub has anopening therein for receiving workpieces and fluent material dischargemeans, said combination further comprising:

means for supplying fluent material to said tub;

means for draining said fluent material; and

means for recirculating said fluent material.

15. The combination according to claim 14 wherein said means fordraining said fluent material includes a tank, cover means slidablymounted on said tank, said cover means including a funnel communicatingwith said tank and a drain catch in said tank.

16. The combination according to claim 15 wherein said recirculatingmeans includes a settling chamber in said tank, an overflow chamber insaid tank, and pump means communicating with said overflow chamber.

17. In a vibratory finishing apparatus having a frame, a pair ofcounterpoise means, a carriage including a workpiece supporting tub andvibratory drive means, the combination comprising:

a plurality of resilient shear-type bushings, each having a pair ofmetal plates secured to opposed vertical surfaces thereof; and

fastener means connecting certain of said metal plates to said frame andcertain other of said metal plates to said counterpoise means andconnecting the remaining metal plates to said carriage. 18. In avibratory finishing apparatus having a frame, a pair of counterpoisemeans, a carriage with a tub thereon and vibratory drive means, thecombination comprising: a plurality of elongated, shear-type bushings,each having concave metal plates, on opposite ends thereof and fasteningmeans on each of said plates; first bolt means connecting certain ofsaid fastening means to said frame;

10 second bolt means connecting others of said fastening means to saidcounterpoise means; and third bolt means connecting still others of saidfastening means to said carriage.

References Cited by the Examiner UNITED STATES PATENTS 2,780,038 2/ 1957Laverdisse 51-292 2,973,606 3/1961 Brandt 51l63 3,063,207 11/1962 Moore51-163 3,073,079 l/1963 Balz 51-163 HAROLD D. WHITEHEAD, PrimaryExaminer.

1. A VIBRATORY DEVICE FOR FINISHING ARTICLES COMPRISING: FRAME MEANS;COUNTERPOISE MEANS INCLUDING A PAIR OF COUNTERPOISE PLATES; RESILIENTMEANS MOUNTING EACH OF SAID COUNTERPOISE PLATES WITHIN SAID FRAME MEANS;A CARRIAGE; RESILIENT MEANS MOUNTING SAID CARRIAGE WITHIN SAID FRAMEMEANS AND BETWEEN SAID COUNTERPOISE PLATES; ECCENTRIC MEANS ROTATABLYCHANNELED IN SAID CARRIAGE AND IN SAID COUNTERPOISE; MEANS MOUNTED ONSAID FRAME FOR DRIVING SAID ECCENTRIC MEANS AND COUPLED THERETO INDRIVING RELATIONSHIP; AND TUB MEANS MOUNTED IN SAID CARRIAGE ON ONE SIDEOF SAID ECCENTRIC MEANS AND A COUNTERWEIGHT MOUNTED IN SAID CARRIAGE ONTHE OTHER SIDE OF SAID ECCENTRIC MEANS FROM SAID TUB MEANS BALANCINGSAID TUB MEANS.